Fatty-acid metabolism in senescing and regreening soybean cotyledons.

Abstract:

:Changes in fatty-acid metabolism were studied in soybean (Glycine max Merr.) cotyledons during senescence as well as in cotyledons which had been caused to regreen by removal of the epicotyl from the seedling. The activities of the enzymes acetyl-CoA synthetase (EC 6.2.1.1) and fatty-acid synthetase in plastids isolated from the cotyledons decreased during senescence but increased in response to regreening. These changes in enzyme activities followed the same pattern as changes in the quantities of chlorophyll and polyunsaturated fatty acids in this tissue. The in-vivo incorporation of [(14)C]acetate into total fatty acids in the senescing and regreening cotyledons did not vary markedly with age. In addition, the quantity of label in fatty acids did not decrease for as much as 60 h after the removal of the substrate. During this 60-h period however, there was substantial redistribution of the label among the individual fatty acids. While the labelling pattern of the individual fatty acids did not vary significantly with respect to age in the senescing cotyledons, there was a substantial increase in the synthesis of labelled polyunsaturated fatty acids in the regreening tissue. Thus, the incorporation of [(14)C]acetate into fatty acids did not reflect the changes in the quantities of the individual fatty acids in senescing tissue as well as they did in regreening tissue.

journal_name

Planta

journal_title

Planta

authors

Place MA,Morgan MS,Rutkoski A,Newman DW,Jaworski JG

doi

10.1007/BF00388746

subject

Has Abstract

pub_date

1979-12-01 00:00:00

pages

246-50

issue

3

eissn

0032-0935

issn

1432-2048

journal_volume

147

pub_type

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